package com.tourguide.modules.order.service;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.tourguide.modules.operation.entity.OperationScenicSpot;
import com.tourguide.modules.operation.mapper.OperationScenicSpotMapper;
import com.tourguide.modules.order.domain.OrderStatus;
import com.tourguide.modules.order.entity.TourOrder;
import com.tourguide.modules.order.mapper.TourOrderMapper;
import com.tourguide.modules.user.entity.GuideReceivingSession;
import com.tourguide.modules.user.mapper.GuideRealtimeStatusMapper;
import com.tourguide.modules.user.mapper.GuideReceivingSessionMapper;
import org.springframework.scheduling.annotation.Scheduled;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class OrderLifecycleScheduler {
    private static final int BATCH_SIZE = 100;
    private final TourOrderMapper orderMapper;
    private final OperationScenicSpotMapper scenicMapper;
    private final GuideOrderMatchingService matchingService;
    private final GuideReceivingSessionMapper sessionMapper;
    private final GuideSessionTransitionService sessionTransitionService;

    public OrderLifecycleScheduler(TourOrderMapper orderMapper, OperationScenicSpotMapper scenicMapper,
                                   GuideOrderMatchingService matchingService,
                                   GuideReceivingSessionMapper sessionMapper,
                                   GuideSessionTransitionService sessionTransitionService) {
        this.orderMapper = orderMapper;
        this.scenicMapper = scenicMapper;
        this.matchingService = matchingService;
        this.sessionMapper = sessionMapper;
        this.sessionTransitionService = sessionTransitionService;
    }

    @Scheduled(fixedDelayString = "${tourguide.order.lifecycle-scan-delay-millis:10000}")
    public void process() {
        cancelExpiredUnpaidOrders();
        retryPendingOrders();
        startDueGroupSessions();
    }

    void cancelExpiredUnpaidOrders() {
        List<TourOrder> orders = orderMapper.selectList(new LambdaQueryWrapper<TourOrder>()
                .eq(TourOrder::getStatus, OrderStatus.PENDING_PAYMENT.getCode())
                .isNotNull(TourOrder::getScenicSpotId).orderByAsc(TourOrder::getPlacedAt).last("LIMIT " + BATCH_SIZE));
        LocalDateTime now = LocalDateTime.now();
        for (TourOrder order : orders) {
            OperationScenicSpot scenic = scenicMapper.selectById(order.getScenicSpotId());
            int minutes = scenic == null || scenic.getUnpaidCancelMinutes() == null || scenic.getUnpaidCancelMinutes() < 1
                    ? 15 : scenic.getUnpaidCancelMinutes();
            LocalDateTime baseTime = order.getPlacedAt() == null ? order.getCreatedAt() : order.getPlacedAt();
            if (baseTime != null && !baseTime.plusMinutes(minutes).isAfter(now)) orderMapper.cancelUnpaid(order.getId());
        }
    }

    void retryPendingOrders() {
        List<TourOrder> orders = orderMapper.selectList(new LambdaQueryWrapper<TourOrder>()
                .eq(TourOrder::getStatus, OrderStatus.PENDING_ACCEPT.getCode())
                .isNotNull(TourOrder::getPaymentTime).orderByAsc(TourOrder::getPaymentTime).last("LIMIT " + BATCH_SIZE));
        for (TourOrder order : orders) matchingService.match(order.getId());
    }

    void startDueGroupSessions() {
        List<GuideReceivingSession> sessions = sessionMapper.selectList(new LambdaQueryWrapper<GuideReceivingSession>()
                .eq(GuideReceivingSession::getStatus, "RECEIVING")
                .isNotNull(GuideReceivingSession::getServiceStartAt)
                .le(GuideReceivingSession::getServiceStartAt, LocalDateTime.now())
                .orderByAsc(GuideReceivingSession::getServiceStartAt).last("LIMIT " + BATCH_SIZE));
        for (GuideReceivingSession session : sessions) {
            sessionTransitionService.startIfDue(session);
        }
    }
}